This thesis has been carried out in collaboration with LEDtec International AB. LEDtec focuses on innovative solutions in LED screens. Everything from large advertising signs to welcome signs in cities, to screens indicating speeds or warning of heavy traffic. The task was to was to help them develop a new version of the control board that is used in some of their products. The reason for this is that their old control board is obsolete and the components that are on it, is no longer manufactured or in need to be renewed. With the new control board developed, the company wants to add new features that were not on the old control board. The task was to find a microcontroller that suited the new control board. Two families of microcontroller were analyzed for this project, Renesas RX series and Atmel ATMega series. The task is also to make a prototype board that LEDtec can use for further development. This report will tell how the making of the prototype board was approached, the choices that were made and why. Information about the components and different approaches will also be presented.